Centrifugal pump.



No. 765,969. PATENTED JULY 26, 1904.

N. K. F. HANSON. OENTRIFUGAL PUMP.

APPLICATION FILED OGT.27, 1903.

N0 MODEL.

Ill

lllll WITNESSES ,4 TTORA/EVS Urvrrazo rarns Patented duly as, race.

NILS KNUT FREDRlK HANSON, OF UTANSJQ, VEDA, SWEDEN.

CENTREFUGAL PUMP SPECIFICATION forming part of Letters Patent No.765,989, dated July 26, 19042.

Application filed October 27, 1903. Serial No. 178,677. (No model.)

To aZZ whom, it may concern:

Be it known that I, NrLs Kno'r FREDRIK HANSON, a subject of the King of.Sweden and Norway, and a resident of Utansjo, Veda, in the Kingdom ofSweden, have invented certain new and useful Improvements in CentrifugalPumps, of which the following is a specification, reference being hadtherein to the accompanying drawings.

The centrifugal pumps at present in use have the disadvantage that theycannot be regulated after they are fitted up for different quantities ofwater or head in any other way than by varying the speed, which is mostfrequently impossible to effect when the motor, transmission-gear, andso on are, as is usual, common to several machines. Besides, if'theeiiect is greatest at a certain speed then it is obviously adisadvantage not to allow the pump to travel at this speed.

This invention therefore relates to an improvement by means of which itis possible to adjust the pump for the head or quantity of water desiredby changing certain pump parts. This is accomplished by the outer wallof the water-channel passing round the turbinewheel or the like beingmade in the form of a detachable part interposed between the plane sidesof the pump-casing, which part can easily be altered in thickness or bechanged for a narrower or broader one as and when required.Centrifugal-pump casings with plane insides are in themselves nothingnew; but the plane part nearest the turbine-wheel has usually beenlimited outward by a flange forming a non-detachable outer wall or hadsuch a small extension radially that it could not form a suitablesurface for a loose interposed partition to rest against.

Figure l in the accompanying drawings presents a side view of the pumpwith half of the pump-casing removed, and Fig. 2 shows the same insection on the line 00 y in Fig. 1. Fig.3 shows a modification.

The pump-casing consists of the two plates 1 2 and the above-mentionedinterposed part 3, mounted between them, the whole being held togetherby bolts or screws 4 or the like. As will be seen, the sides or covers 1and 2 are plane on the inside from the periphery of the turbine-wheel 5and out to the outer edge, and it will further be seen that the saidplane part has relatively large dimensions radially. In consequence ofthis it is possible by mounting a broader or narrower interposed part 3in a radial direction to vary the depth or breadth of the groove orslot-like water channel orchamher 6, according to the amount of pressureor head. At a greater head a broader interposed part is employed and ata lower head a narrower one. i In the drawings is shown an interposedpart ofsmall breadth that is with great inner diameter, and it will beseen that the same can be substituted by a part of considerably smallerinner diameter without any detrimental space arising in consequencethereof between the same and the adjacent sides 1 or 2. The channel orchamber or groove 6, which in consequence of the plane sides of theWalls 1 2 imparts to the Water a flow as free from eddies as possible,thus has in every instance a really exact form, such as is alluded to.Obviously a thicker or thinner interposed-part 3 may be substituted, anda suitable turbinewheel may be mounted on the shaft 9, according to thehead or pressure. For a greater head a thinner part is interposed, andfor a smaller head or greater volume of water a thicker part'isinterposed. The interposed part 3 may obviously also consist of severalsuperposed plates, the number of which is increased or diminished,according to the desired dimensions, in the direction of the axis of thechannel or chamber 6. Fig. 3 shows a number of such superposed plates.Another advantage connected with the invention described is that theinside surfacescan be so easily turned and polished that the vanes ofthe turbine-wheel or the like fit well against the same.

The object in varying the size of the inner casing of the pump or of thewater channel or chamber is to provide means whereby the pump will beadapted to greater or smallerheads of water, as the greater the head ofwater the smaller must be the area of transmission fer the same quantityof water, as the water for agreater head must have a correspondinglygreater speed, and therefore the pump-casing will be smaller for agreater head Ice than for a smaller one. it will also be seen that thewater chamber or channel in which the wheel 5 is placed is of muchgreater diameter in one direction than in the other, and the outlet 10thereof is placed at one end of the greater diameter thereof and isformed tangentially thereto, while the inlet from. said ch amber orchannel is formed centrally of the side plate 2, as shown at ll.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

A centrifugal pump, comprising a casing composed of two side plates andan intermediate annular plate, said plates being connect ed at theperimeters of the side plates so as to form a central water channel orchamber, said channel or chamber being of greater diameter in onedirection than in the other, and a turhing-wheel mounted in said chamberor channel eccentricflly thereof, and said chamber or channelbeingprovided with a tangential outlet at one end thereof and with acentral inlet formed in one of the side plates thereot',.the

turbine-wheel being also provided with a shaft which passes through theopposite side plate, and the annular plate being changeable so as tovary the depth of said chamber or channel, substantially as shown anddescribed.

In witness whereof l have hereunto signed my name in the presence of twosubscribing witnesses.

NILS KNUT FREDRIK HANSON. Witnesses: Area PETnRs,

Unannns Enlosson.

